The Chinch Bug and Its Control. 29 
SPRAYING THE BUGS IN WHEAT. 
As soon as mating has become common, it may be assumed that 
sufficient migration from winter quarters to wheat has occurred to 
warrant spraying with the formula given on page 21. If at this time 
the infestation in the wheat extends over only a narrow margin of 
the field, before spraying is attempted it will be advisable to de- 
termine whether it may be less costly to plow the infested strip 
under to a depth of at least 7 inches, beginning at the innermost 
infested row, and immediately harrow and roll or drag it. If an 
efficient type of sprayer and a supply of insecticide are immediately 
available, however, the bugs may be effectively destroyed by spray- 
ing. In May or early June, depending upon locality and season, the 
bugs developing in the wheat should be sprayed. As already stated, 
the spraying should be done after the bugs begin mating and be- 
fore the wheat is in full head. The smaller the wheat is when 
sprayed the greater. the saving in time and spray material and the 
larger the number of bugs that will be killed. Hence, after the 
bugs are heavily massed on the wheat, the sooner the spraying is 
done the better. It is important to remember this fact, that only 
those bugs hit by the spray will be killed, and therefore thorough 
application, using plenty of liquid at high pressure, is absolutely 
necessary. From 1,500 to 2,500 gallons of spray material per acre 
will be required, depending on the height of the wheat. 
Infestations in rye, barley, and oats should be treated the same 
as those in wheat. 
While the bugs usually begin to leave the wheat for the nearest 
cornfield about 10 days before harvest, it sometimes happens that 
a vast majority of them remain in the wheat until it is cut. In such 
cases they may be destroyed and consequent injury to the corn pre- 
vented by spraying them in the stubble along the margin of the 
field immediately following the binder. 
SPRAYING THE BUGS IN CORN AND TRAP CROPS. 
As soon as the migration from the wheat has ceased, the bugs on 
the early summer trap-crop standing between wheat and corn, if 
such trap planting has been made, should be destroyed. One of the 
most effective ways of doing this is by spraying. As there is no 
need for saving this trap-crop, the spray mixture may be strengthened 
up to 3 per cent, or a strong mixture of kerosene and water used. 
Unless a sprayer and solution are immediately available, however, 
the trap-crop should be plowed under deeply and the ground firmed 
immediately thereafter. 
To destroy chinch bugs in corn by spraying on a broader scale 
than merely the first. few heavily infested marginal rows, is much 
